WHEN TURN ON KEY AFTER SITTING OVERNIGHT BRAKE ...

1999 Lexus GS 400

Tiny

jcone

March, 11, 2013 AT 5:08 PM

When turn on key after sitting overnight, brake booster makes squeaking sound as it pumps up. This lasts only seconds. Seems to be increasing in frequency. Is this serious? What is cause? Solution?
Thanks

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3 Answers

Tiny

Dr. Hagerty

March, 11, 2013 AT 6:07 PM

Its difficult to hear what you hear from here, but it does seem to be unusual. Perhaps the booster will require replacement, I am not sure, but it might be a possibility.

Tiny

jcone

March, 11, 2013 AT 7:06 PM

On another site it was suggested that the vac line from the booster might be leaking, or its fitting might. It also suggested I move the line around with sound occurring to see if this could be confirmed. ANy thoughts about this?

Tiny

mhpautos

March, 12, 2013 AT 11:43 PM

It may just be a dry dust seal, is the noise constant or only when the pedal is pressed?

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